<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>IE嵌套点击问题测试</title>
    <style>
        .btn{
            margin: 100px auto;
            cursor:pointer;
            font-size: 16px;
            display: block;
            height: 50px;
            border-radius: 25px;
            border: none;
            outline: none;
            background-color: #ff8300;
            box-shadow: 0 3px 9px 0 rgba(255, 131, 0, 0.35);
            color: #fff;
            width: 120px;
            position: relative;
            overflow: hidden;
        }
        span{
            display: inline;
            position: relative;
            z-index: 1;
        }
        .btn:hover{
            box-shadow: 0 5px 13px 0 rgba(255, 131, 0, 0.59);
            top:-2px;
        }
        .btn:active{
            box-shadow: 0 3px 9px 0 rgba(255, 131, 0, 0.35);
            color: #ffca8c;
            background-color: #f07b00;
            top:0;
        }
        .btn:after{
            position: absolute;
            content: "";
            display: block;
            margin: auto;
            width: 0;
            height: 0;
            left:60px;
            top: 25px;
            background: rgba(255, 157, 0, 1);
            border-radius: 50%;
            opacity: 0;
            transition: all 0.5s;
        }
        .btn:hover:after{
            left: -40px;
            top:-75px;
            width: 200px;
            height: 200px;
            opacity: 1;
            transition-duration: 0.5s;

        }
        .btn:active:after{
            width: 0;
            height: 0;
            left:60px;
            top: 25px;
            opacity: 1;
            transition-duration: 0s;

        }
    </style>
</head>
<body>
<button type="button" class="btn">
    <span>buttonB</span>
</button>

</body>
</html>